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Claude: hide the sidebar

Hides the left navigation sidebar with the conversation list and expands the chat area.

Code to copy

/* Hide the left navigation sidebar */
nav[aria-label*="sidebar" i],
[data-testid="menu-sidebar"],
header + div > nav:first-child {
  display: none !important;
}
main { margin-left: 0 !important; }

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's CSS panel and save — the effect appears instantly.